Quick answer
An overdraft gives you a fixed limit on your transaction account, set by the bank and often secured by property, and suits short, recurring dips in cash. Invoice finance advances most of the value of unpaid customer invoices, so the limit rises as your sales rise. Overdrafts usually cost less and suit almost any business; invoice finance suits B2B firms whose customers pay on long terms.
Key points
- An overdraft limit is a number the bank sets and reviews; an invoice finance limit is a share of what customers owe you
- Bank overdrafts are often the cheapest working capital you'll find when you qualify
- Invoice finance needs no property, but it only works if you sell to other businesses on credit terms
- Large businesses took 64 days to pay 95% of small business invoices in early 2025, which is where invoice finance earns its keep
- Running both is possible, but the overdraft lender usually has to agree to release your receivables
- Overdraft limit set by
- Bank review of financials
- Invoice finance limit set by
- Eligible unpaid invoices
- Overdraft security
- Often property, plus guarantees
- Invoice finance security
- Receivables, usually a GSA
Think of a wholesale food distributor that turned over $2m last year and is on track for $3.5m this year after landing two supermarket accounts. Its $150k overdraft was approved on last year’s numbers. Every new order now ties up more cash in stock and in invoices the supermarkets won’t pay for 60 days, yet the overdraft limit hasn’t moved, because the bank won’t review it until the next set of financials. Growth is starving the business of cash.
That’s the core difference between these two products. An overdraft gives you a limit somebody chose. Invoice finance hands you a ceiling built from what customers currently owe, so it rises and falls with them.
How does each one actually work?
An overdraft sits on your normal trading account. You can take the balance below zero up to that limit, interest runs only on the overdrawn amount, and every deposit reduces it. The bank sets the limit from your financial statements and account conduct, usually reviews it each year, and often takes property as security for larger amounts. Overdraft services appear on business.gov.au’s short list of standard bank products.
Invoice finance uses your accounts receivable as the security. Each time you bill a business customer, the financier advances an agreed share of it, commonly around 70% to 85%, and collects or receives the payment when it arrives. As you invoice more, more money becomes available. Business.gov.au describes factor companies as providers that buy a business’s outstanding invoices at a discount; confidential versions let you keep collecting yourself. Our invoice finance page covers the mechanics in full.
Side by side
| Business overdraft | Invoice finance | |
|---|---|---|
| What sets the limit | The lender’s view of your financials | The value of eligible unpaid invoices |
| Does it grow with sales? | Only when the lender reviews and agrees | Automatically, as invoices are raised |
| Security | Often property for larger limits; directors’ guarantees | Your receivables, usually under a general security agreement; directors’ guarantees |
| Who it suits | Almost any business with steady banking | B2B businesses selling on 14 to 90 day terms |
| Costs | Interest on the drawn balance, plus account and limit fees | Service fee on invoices processed, plus a charge on funds drawn |
| Set-up time | One to several weeks at a bank | Often one to two weeks for a whole-ledger facility |
| Paperwork once running | Light | Regular invoice uploads, debtor reconciliations, audits |
| Customers know? | No | Only if it’s a disclosed (factoring) facility |
| Typical lenders | Banks; some non-banks | Specialist invoice financiers, some banks |
Where does the overdraft come out ahead?
On cost, when you qualify. A secured bank overdraft is very hard to beat. Interest runs only on what you’ve drawn, there’s little admin, and nobody needs to see your invoices. If your bank will give you a limit that covers your real gaps, take it seriously.
When your customers pay on the spot. Retailers, cafés, salons and most trades paid on completion have no unpaid invoices to finance. For them the comparison is really an overdraft against a line of credit, which we cover in overdraft vs line of credit.
For small, predictable dips. The quarterly BAS payment, a slow week before a big deposit, the month a supplier wants paying early. Short dips that bounce back quickly are exactly what an overdraft is for. Business.gov.au cautions against leaning on an overdraft for capital purchases or long-term finance.
When you value simplicity. No uploads, no debtor reconciliations, no auditors checking a sample of your invoices.
Where does invoice finance come out ahead?
When customers make you wait. Figures released by the Payment Times Reporting Regulator in February 2026 showed big companies needed 64 days to settle 95% of what they owed small suppliers over January to June 2025, against 58 days previously. If your biggest customers sit at the slow end of that range, you’re effectively lending to them, and invoice finance turns those IOUs into cash within a day or so of invoicing.
When you’re growing quickly. The distributor above doesn’t need to wait for a bank review: each supermarket order it bills adds to what it can draw.
When there’s no property to offer. Many owners rent their premises and either don’t own a home or would rather not put it up. Invoice finance relies on the debts owed to you, not on bricks and mortar.
When the bank has said no. A refused overdraft increase is often about last year’s numbers or a lack of security. An invoice financier cares more about who owes you money than about your balance sheet, so a business with a thin profit history but blue-chip debtors can still qualify.
Working out which one your numbers support? Give us a rough outline and someone experienced will say which. Asking doesn’t involve a credit check.
A worked example in dollars
An illustrative engineering supplier invoices $300k a month to builders, who pay on 45-day terms. On a typical day about $450k is outstanding.
- Overdraft route. The bank offers a $100k overdraft secured over the owner’s home. If the business averages $70k drawn, the cost is interest on that $70k plus account fees. Cheap, but $100k doesn’t cover a $250k gap when two big jobs land at once.
- Invoice finance route. Suppose $400k of the ledger is eligible and the advance is 80%. That’s up to $320k available, rising further as invoicing grows. The business pays a service fee on what it processes and a charge on the funds it actually draws. If it draws an average of $200k, the dollar cost is higher than the overdraft’s, but it can take on work the overdraft would have forced it to turn down.
Try your own numbers in the invoice finance calculator, and measure the size of the hole with the cash flow gap calculator.
Can you run both?
Yes, and many established businesses do: an overdraft for day-to-day wobbles, invoice finance for the larger gap created by customer terms. The practical hurdle is security. Banks frequently secure an overdraft with a general security agreement that sweeps in everything the business owns, receivables included. The invoice financier needs first claim on those receivables, so your bank will usually have to sign a deed releasing or subordinating its interest. Raise it early; some banks prefer to offer their own invoice finance instead. If you’re new to these documents, our glossary entries on the general security agreement and the PPSR are a good starting point.
Questions to settle before you choose
- Do most of your sales go to other businesses on credit terms? If not, invoice finance is off the table.
- How large is your biggest cash gap, and how often does it recur?
- Will your bank lend enough, at what limit, and against what security?
- Is your bookkeeping up to date enough for weekly invoice uploads and monthly reconciliations?
- Does the invoice finance contract have a minimum term, minimum monthly fee or exit fee?
- Would your customers mind dealing with a financier, or do you need confidentiality? See factoring vs discounting.
Turn a fixed limit into the right one
If your overdraft no longer stretches as far as your order book, you aren’t alone, and it’s a solvable problem. Let us know your debtor balance, your customers’ usual payment speed and any security on offer, and we’ll show you whether invoice finance, a bigger limit elsewhere or a mix of the two fits. The enquiry needs only a minute or so, and it leaves your credit history alone. Your information isn’t blasted across a panel of financiers: one of our team works through it personally, then phones you. Exact figures on the ledger and your terms of trade help, so the facility we suggest is sized correctly from day one.
Frequently asked questions
Is invoice finance more expensive than an overdraft?
Usually, yes. A secured bank overdraft is one of the lowest-cost forms of business credit. Invoice finance carries a service fee on invoices processed plus a charge on funds drawn, and sometimes minimum monthly fees. It can still be better value if it gives you access to far more money than the bank would, or replaces costlier short-term loans.
Can I have an overdraft and invoice finance at the same time?
Yes, but it takes some arranging. Many bank overdrafts are backed by a general security agreement covering all business assets, including receivables. The invoice financier will want first claim on those receivables, so your bank usually needs to sign a priority or release deed.
What if my bank won't increase my overdraft?
Ask what would change its mind, such as more security or updated financials. If the answer is still no and you sell to businesses on credit terms, invoice finance is a common next step because it doesn't depend on property. A business line of credit from a non-bank lender is another.
Do I need property for either one?
Not always. Smaller unsecured overdrafts exist, and some non-bank lenders offer overdraft-style facilities assessed on bank data. Larger bank overdrafts are often secured by property. Invoice finance is secured by your receivables, so property isn't usually needed, though directors normally give guarantees.
Which is better for a business that sells to consumers?
An overdraft or line of credit. Invoice finance relies on invoices issued to other businesses on payment terms, so a café, retailer or trade business paid on the spot has nothing for an invoice financier to lend against.